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How do you reset the computer on a 1999 Pontiac Montana?

A 1999 Pontiac Montana doesn't have a "computer" in the sense of a device that can be reset like a desktop PC. What you likely want to do is reset one of its *electronic control modules* (ECMs), specifically the Powertrain Control Module (PCM) — often referred to as the Engine Control Unit (ECU). This is done to try and resolve certain issues, not as a general "reset."

There's no single button or switch to do this. The methods vary depending on the specific problem and the exact year/model within the 1999 Montana range. Here are the most common approaches:

* Disconnect the battery: This is the simplest and often the most effective method. Disconnect the negative (-) terminal of the battery for at least 30 minutes (some recommend longer, up to an hour or overnight). This clears the PCM's memory and resets various parameters. Reconnect the terminal and start the vehicle. The PCM will relearn its settings during normal driving.

* Using a scan tool: A professional-grade OBD-II scanner can offer more specific reset options. A mechanic or advanced DIYer with a suitable scan tool can sometimes clear codes and reset the PCM through the diagnostic port. This is more precise than simply disconnecting the battery.

Important Considerations:

* Specific Problem: Before attempting any reset, identify the issue you're trying to solve. A reset might not fix every problem, and in some cases, it could even mask a more serious underlying issue.

* Check the Owner's Manual: Your Montana's owner's manual might have specific instructions related to resetting the PCM or addressing common electronic problems.

* Professional Help: If you're not comfortable working with car electronics, it's best to take your Montana to a qualified mechanic. Improperly handling car electronics could damage your vehicle's systems.

In short, there's no "reset button." Disconnecting the battery is the most accessible method for a general reset. If that doesn't resolve the problem, professional assistance is advisable.

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